Partikelemissioner i väg- och järnvägstunnlar - källor och åtgärder

Emissions in road and railroad tunnels

Tunnel environments stands in the current situation outside EQS limits for particulates, while the measurements show that these environments have the highest concentrations in the transport system. This applies to road tunnels as well as railroad tunnels. The exposure of road users in vehicles and on platforms, and for staff who work in underground environments (operation and maintenance, ticket sales, etc.) are usually high, but short-lived compared to above ground where concentrations are lower but the exposure is usually more prolonged. Long tunnels being built in several major infrastructure projects in Sweden, where the handling of the expected high particle concentration is a significant and difficult problem. The particle sources differ between road and rail environments. In road environments resulting high particulate levels from wear of road surfaces, especially when use of studded tires, while the numbers are high concentrations of ultrafine particles from vehicle exhaust. In railway environments are particle sources mainly wear of brakes, wheels, rails and overhead lines. The present project proposal aims to identify and quantify the major particle sources in road and rail tunnel environments and broadly analyze the measures related to both material and traffic that the tunnel environment, which can most effectively reduce emissions.